In order to determine effects of acid-binding capacity levels in dietary on performance and nutrient apparent digestibility of lambs, 24 Sannen male lambs at 7 days of age were randomly allocated to 4 groups. Lambs in group A were fed basal diet and in groups B, C and D were fed three experiment diets with 3.0,9.0 and 15.0 kg/t acidifier addition in the basal diet, respectively (the acidbinding levels of supplementary were 30.0, 20.0 and 10.0 mmol HCl/100 g, respectively; the acidbinding levels of diet were 39.3, 35.2 and 31.1 mmol HCl/100 g, respectively) The feeding experiment and digestibility test were conducted to determine effects of acidbinding capacity levels in diet on performance and nutrient apparent digestibility of the earlyweaning lambs. The results showed that: 1) weight gain in groups B, C and D were significantly higher than that of group A (P<0.01) Weight gain of groups C and D were significantly higher than that of group B (P<0.05); 2) health condition was improved by acidifier inclusion. Diarrhea rate in groups B, C and D were decreased by 36.36%, 28.65% and 81.82% compared with group A, respectively; 3) CP and GE apparent digestibility of groups B, C and D were significantly higher than that of group A (P<0.01). CP and GE apparent digestibility of groups C and D were significantly higher than that of group B (P<0.01); 4) DM apparent digestibility of groups B, C and D were significantly higher than that of group A (P<0.01). DM apparent digestibility of groups C and D were significantly higher than that of group B (P<0.01) and group D was significantly higher than that of group C (P<0.05). The results suggested that the daily gain, feed to gain ratio and apparent digestibility of main nutrition were significantly improved with the decrease of acidbinding levels in dietary. Simultaneously, the healthy condition of lambs was effectively improved. The group that supplementary acid-binding level was 10.0 mmol HCl/100 g and diet acid-binding level was 31.1 mmol HCl/100 g had the best effect in this research.